Modeling on Dry Centrifugal Granulation Process of Molten Blast Furnace Slag

Abstract

Lots of iron molten slag from blast furnace can be produced during iron making process. It is generally cooled by water quenching method which causes many problems, such as water consumption, serious pollution, energy wasting etc. To solve these problems, much more attention has been paid to various dry granulation methods. Among them, dry centrifugal granulation (DCG) method has its own advantages. In this study, a physical and mathematical model of slag flow behavior in DCG process is established. The DCG process with a flat disc at different mass flow rate, temperature or viscosity, surface tension of molten slag, rotating speed and surface roughness of disc is simulated. The influences of various factors on granulation process are analyzed and optimum parameters are obtained. The results show that the granulation can be greatly improved by increasing the rotating speed of the disc and by reducing the molten slag viscosity properly.